Steam superheater



Jan. 22, 1929. 1,699,943

R. B. ARMSTRONG S TEAM SUPERHEATER Filed Feb. 5, 1928 3 Sheets-Sheet 1 Aggy; l/vvz/vrop BY Ma M I i ro/ me'rs Jan. 22, 1929. 1,699,943

R. B. ARMSTRONG STEAM SUPBRHEATER Filed Feb. 1928 3 Sheets-Sheet 2 //v VEN fbl? HTTO FNEYS Jan. 22, 1929.

R. B. ARMSTRONG STEAM SUPERHEATER Filed Feb. 1928 3 Sheets-Sheet JVTTOlF/VEYS Patented Jan. 22, 1929.

UNITED STA TE S PATENT OFFICE.

ROBERT BAYLES ARMSTRONG, OF NEWCASTLE-ON TYNE, ENGLAND, AS S'IGNOR T0 ROBERT BAYIJES ARMSTRONG, AND R. & W HAWTHORN LESLIE & COMPANY LIM- ITED, 0F NEWCASTLE-ONTYNE, ENGLAND.

STEAM SUPERHEATER.

Application filed February 3, 1928, Serial No. 251,675, and in Great Britain October 12, 1927.

This invention relates to superheaters of the kind in which U or like shaped tubes .are associated with a single header partitioned to constrain steam to flow through the tubes in proper paths, and it has for its object to provide an improved construction and arrangement of parts affording sundry advantages.

One feature of the invention consists in conducting steam from a boiler into a tubular superheater header through an end cover provided with what is virtually an extension of ;he steam inlet pipe divided longitudinally and forming partof the partition system, the construction being one which enables the whole of the parts Within the header to be collectively withdrawn by and with the end cover when desired.

Another feature of the invention consists in the provision within a tubular header, of a partition system adapted to conduct steam successively from interior to outer rows of U tubes nested in a common plane transversely of the header, a path for the steam being thus provided which gradually extends to a heating zone of higher temperature.

A further feature of the invention consists in an assemblage of parts of the kind referred to which, in the form of a compact multi-flow structure, provides a path for the steam rela tively longer than usual thereby enabling the temperature of the superheat to be increased.

In the accompanying drawings, Fig. 1 is a more or less diagrammatic front view partly in elevation and partly in section of a boiler showing one constructional form of superheater, according to the invention, applied thereto. Fig. 2 is a sectional side elevation also mainly diagrammatic. Fig. 3 is a section taken at the line 33 Fig. 2 of the superheater. Fig. 4 is a view to a larger scale of a portion of Fig. 1 showing more detail and Fig. 5 is a vertical transverse section of such portion.

According to this example, which is an installation comprising two so-called six-flow superheaters, a header 1 is employed for each superheater flanged at opposite ends, one of which flanges 2 is closed by a dead cover 3 and the other flange 4 by a cover 5 to which is attached a frame adapted to fit closely within the header, there being at least three longitudinal members triangularly arranged to centralize the frame in the header, in this instance five such members serving this pur pose as will hereafter appear. The cover -5 to which the frame is attached may have an axially arranged steam inlet branch 6 COIl'lIIlLlIll eating with a central pipe 7 which extends to the dead cover 3 and has a portion removed longitudinally so as to provide a gap at 8 the divided edges 8 coincidingwith two partitions, 9, 10, one 9 extending to the wall of the header at a point between'the inlet and outlet ends 11, 12 of a central row of U tubes and the other 10 extending to a point which separates the outlet ends 13 of a second row of U tubes from the inlet ends 11 of the inner row of tubes. An auxiliary partition 14 serves to place the outlet ends 13 of the second row of tubes in communication only with the inlet ends 15 of the outermost row of U tubes, whilst a second auxiliary partition 17 serves to isolate the outlet ends 18 of this outermost row of tubes from all the others, leaving them free to discharge into the space 19 around the central pipe portion 7 of the frame aforesaid. 20 is a partition which with the partitions 9, 10, 14 and 17 constitute the five longitudinal members referred to. As will be understood the spaces between the partitions 9, 10, 14 and 17 are closed at the upper end by plating 21. Steam from the space 19 may be conducted away by a lateral branch 22 provided upon the header near the end at which steam is supplied to the superheater, said branch being shown in its proper angular position in Fig. 3 but in unnatural positions in Figs. 1 and 2 for the sake of simplification of the drawing. The several rows of tubes of such a superheater may be supported intermediate of their length by metal bars 23 so recessed that collectively, when assembled transversely of the header, each tube run is held against movement in any lateral direction. Conveniently these bars 23 may have bent ends 24 and be individually bolted to stays or girders.

Superheaters according to the invention may be usefully incorporated in various forms of water tube steam boilers the two headers in the present example being arranged beyond the sets 25, 26 of inclined generating tubes connecting lower water drums 27 to upper steam and water drums 28 so that the su. erheating tubes extend across and above said generating tubes. In such a case, the tube support-ing bars 23 of each superheater may be connected as by bolts 29 at their upper ends to a channel iron 30,0ne end of which is connected, as by a link 31, to a bracket 32 upon the associated steam and Water drum Whilst the other end is suitably bent, extended and notched as at 33 to rest upon an angleiron 34: carried by the lower Water drum 27 at that side of the boiler. No undue strain is thus set up by expansion and contraction. In Fig. 1 the dot and dash lines represent the interior fitting of the right hand header as Withdrawn for inspection.

What I claim is 1. A superheater comprising a tubular header having a lateral outlet branch, substantially U shaped tubes extending from such header, of which tubes those of any single row are nested in a common plane transversely of the header, a dead cover at one end of the header, a cover at the other end of the header having an axially arranged steam inlet branch, a pipe centrally arranged in the header, Which pipe communicates With the inlet branch aforesaid, extends to the dead cover and has a portion removed longitudinally, partitions extending to the header from the divided edges of the tube adjacent the gap thus formed, and other longitudinal partitions also extending to the header, adapted to produce a series fioW of steam through the tubes of a row.

2. In a superheater of the kind referred to comprising a header and rows of tubes extending therefrom, each roW nested in a common plane transversely of the header, means adapted to support the tubes intermediate of their length comprising metal bars recessed and collectively assembled transversely of the header to isolate each tube row from another, members arranged parallel to the header to which such bars are attached at opposite ends, one such member having a bent and notched end, a rail upon which the notched end rests and link supporting means attached to the otherend of the said member.

Signed at Newcastleon-Tyne, England,

ROBERT BAYLES ARMSTRONG.

this 6th day of January, 

